More information about the stalled network connection issue that occurs with Vista when behind some firewalls/routers.

This relates to having to use:
*netsh interface tcp set global autotuninglevel=disabled*
to restore proper TCP-IP operation behind some firewalls/routers.

The noteworthy addition to this KB article over what has been previously known:

*NetApp Cache Appliances NC 6.0.2 or an earlier version*

The TCP splicing feature may not work together with the Window Scaling feature in Windows Vista. By default, the TCP splicing feature is enabled on NetApp Cache Appliances NC 6.0.2 or on an earlier version.

*Cisco PIX 6.1(5), Cisco PIX 6.2(3), and Cisco PIX 6.3(1)*

These devices do not support the Window Scaling feature in Windows Vista.

*Cisco IOS Software Release*

Cisco IOS Software Release 12.3(15) and later versions of this software support the Window Scaling feature in Windows Vista.

*Sonicwall*

The Window Scaling feature in Windows Vista may not work if you enable either of the following features on a Sonicwall firewall device: Strict TCP Enforcement Option, Enforce strict TCP compliance with RFC 793 and RFC 1122

*Checkpoint NG R55*

To work around this issue, disable the Sequence Verifier Enforcement feature.

Handy online site to test your home connectivity capabilities.
You will want to use Internet Explorer on this site for proper behavior.

The "official" description:
The Internet Connectivity Evaluation Tool checks your Internet router to see if it supports certain technologies. You can use this tool on a PC running either the Windows Vista or Windows XP operating system. If you're planning to run Windows Vista, this tool can verify whether your existing Internet router supports advanced features, such as improved download speeds and face-to-face collaboration using Windows Meeting Space.

I'm personally happy that NetMeeting is going the way of the dodo but there are still some applications and needs that rely on the program and related DLLs. If you really need NetMeeting under Vista, you can request this hotfix.